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olefine

From The Collaborative International Dictionary of English v.0.48:

olefin \o"le*fin\, olefine \o"le*fine\([=o]"l[-e]*f[i^]n or
   [=o]"l[-e]*f[=e]n), n. [From Olefiant.]
   1. (Chem.) Olefiant gas, or ethylene. See Ethylene.
      [archaic]
      [1913 Webster]

   2. Hence: (Chem.) Any one of the series of unsaturated
      hydrocarbons of which ethylene is the type; a member of
      the alkene series of hydrocarbons; an alkene.
      [1913 Webster + PJC]

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